Psalms 148:12

Both young men, and maidens - Those in the morning of life, just entering on their career; just forming their character: with ardor, elasticity, cheerfulness, hope; let them consecrate all this to God: let all that there is in the buoyancy of their feelings, in the melody of their voices, in their ardor and vigor, be employed in the praise and the service of God.

Old men, and children - Old men, with what remains of life, and children, with all that there is of joyousness - let all unite in praising God. Life, as it closes - life, as it begins - let it all be devoted to God.